linux-kernel - Re: [PATCH] arm64: dts: mt8173: Re-measure capacity-dmips-mhz

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Date:   Thu, 9 Jul 2020 02:55:26 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Ikjoon Jang <ikjn@...omium.org>
Subject: Re: [PATCH] arm64: dts: mt8173: Re-measure capacity-dmips-mhz

On Thu, Jul 9, 2020 at 1:01 AM Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 06/07/2020 10:37, Hsin-Yi Wang wrote:
> > Re measure capacity-dmips-mhz on elm and hana:
> >
> > cpu 1:  9502 DMIPS @ 1703 Mhz
> > cpu 3: 16250 DMIPS @ 2106 Mhz
> >
> > ==> 740 : 1024
>
> I have some trouble to match the commit message to the actual patch. Commit
> message talks about cpu 1 but patch changes cpu0. Where are the values of the
> other CPUs?

Small cpu on 8173 is cpu0 & cpu1, while big cpu is cpu2 & cpu3.
Small cpu: 9502 DMIPS @ 1703 Mhz
Big cpu:   16250 DMIPS @ 2106 Mhz

9502/1703 : 16250/2106 = 740 : 1024 (scale big cpu to 1024), and this patch
changes the small cpu value to 740.



>
> Regards,
> Matthias
>
> >
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > ---
> >   arch/arm64/boot/dts/mediatek/mt8173.dtsi | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > index 70b1ffcab7f0..5e046f9d48ce 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > @@ -167,7 +167,7 @@ cpu0: cpu@0 {
> >                                <&apmixedsys CLK_APMIXED_MAINPLL>;
> >                       clock-names = "cpu", "intermediate";
> >                       operating-points-v2 = <&cluster0_opp>;
> > -                     capacity-dmips-mhz = <526>;
> > +                     capacity-dmips-mhz = <740>;
> >               };
> >
> >               cpu1: cpu@1 {
> > @@ -182,7 +182,7 @@ cpu1: cpu@1 {
> >                                <&apmixedsys CLK_APMIXED_MAINPLL>;
> >                       clock-names = "cpu", "intermediate";
> >                       operating-points-v2 = <&cluster0_opp>;
> > -                     capacity-dmips-mhz = <526>;
> > +                     capacity-dmips-mhz = <740>;
> >               };
> >
> >               cpu2: cpu@100 {
> >